MAC Protocol for Wireless Sensor Networks
Tian Ming · Jisuanji gongcheng · 2009
This paper proposes a new MAC protocol named Self Adaptive SMAC aiming at the deficiencies of back off mechanism in SMAC. Self Adaptive SMAC introduces the exponential back off mechanism based on SMAC, and then analyzes the key performance parameters of the back off process using Markov model. According to the results of the analysis, it further introduces a counter to accumulate the times of busy state of the communication channel, through which nodes have the ability to estimate the congestion situation of the channel. It adaptively changes the size of collision window to reduce collision according to the information about congestion situation, consequently the energy efficiency and throughput are improved. The simulation results later show that Self Adaptive SMAC has better energy efficiency and better channel utilization compared with the original protocol SMAC.